Adjustable condenser



Dec. 28. 1926. 1,612,414

- W. C., BRUMDER ADJUSTABLE CONDENSER Filed July 31, 1922 2 sheets-sheet 1 Dec. 28,1926. 1,612,414

W.C.BRUMDER ADJUSTABLE CONDENSER Filed July 31. 1922 2 Sheets-Sheet 2 XM 2am Patented Dec. 28, 1926.

WILLIAM C. BRUMDER, OF MILXVAUKEE, \VISCONSIN.

ADJUSTABLE CONDENSER.

Application filed July 31,

My invention relates to condensers, and more particularly to adjustable condensers.

It is a purpose of the invention to provide a condenser that is adjustable so that the one plate thereof can be moved toward the other plate thereof at a comparatively rapid rate when said plates are widely separated, and at a lower rate when the plates are close together, thus providing for a fine adjustment when the same is needed and a coarser a justment when the fine adjustment is not as necessary. As is well known, the change in the capacity of a condenser is very much more rapid when the plates are close together than when they are far apart, and that differences in distance between the plates has a greater effect when they approach each other than when they are a considerable distance from each other. For this reason it is desirable to provide means whereby a fine adjustment can be obtained when desired, and ordinarily if such means is provided it requires a large amount of turning of the adjustment means when the plates are spaced a considerable distance apart to obtain any variations that are noticeable in the capacity of the condenser.

It is a purpose of the invention to provide means for adjusting a condenser which 18 operated by a single operating member, whereby said condenser can be closely adjusted where necessary and more roughly adjusted where a close adjustment is not necessary.

Other objects and advantages of the invention will appear as the description ofthe accompanying drawings proceeds. However, I desire to have it distinctly understood that I do not intend to limit myself to the exact details shown or described, but that I intend to include as part of my invention all such obvious changes and modifications of parts as would o cur to a person skilled in this art, and as would fall within the scope of the claims.

In the drawings:

Fig. 1 is a side elevation of my improved adjust-able condenser showing one way of obtaining the adjustment of the plates;

Fig. 2 is an end elevation thereof partly in section on the line 2-2 of Fig. 1;

F ig. 8 is a sect-ion thereof taken on the line 3.3 of Fig. 1;

Fig. 4c is a section similar to Fig. 1 of a different form of the invention;

1922. Serial No. 578,658.

F ig. 5 is a section. thereof taken on the line 5+5 of Fig. 4; and w Fig. 6 is a section thereof taken on the line 6-6 of Fig. 4-. Referring in detail to the drawings, my mproved condenser in the form shown in Figs. 1 to 3 inclusive comprises a base men.- ber 10 of any suitable insulating material having a support 11 thereon secured thereto by any suitable securing means, such as the screws 12. Said support is. provided with an upwardly turned end portion 13 to which the standard 14 is secured by means of the bolt 15, said bolt 15 ant said standard 14 being insulated from the member 11 b means of the insulating material 16, 17 and 18. A terminal 19 is provided on the member 11 having the clamping nut 20 for securing any suitable conductor thereto. Electrically connected with the member 11 and supported by means of the member 23 is the plate 24. of the condenser. The opposite plate 25 of the condenser is provided with standard 26 entending upwardly therefrom, said standard 26 being secured to the gears 27 and; 28 by means of the screws 29 and 30, thus forming a connection between the plate 25 and the gears 27 and 28, similar to that of a driving rod. The gears 27 and 28 mesh with the worms 31 and 32 provided on the shaft 83 llilVlDf the thumb nut 34 on the end thereof, said shaft 33 being journaled in bearings in brackets 35 and 36 provided on the arms 37 and 88 which are cured to the standard 1% by any suitable securing means 397-40. and which extend laterally therefrom. It will thus be. seen that the plate 25 is electrically connected with the terminal 21 through the gears and supporting brackets described.

It will also be seen that due to the pro vision of the connecting rod 26 the rotary motion of the gears 27 and 28 obtained by turning the thumb nut 3-1 will be changed into a. substantially straight line motion length vise of the connecting rod 26, and due to the fact that the components of the rotary mov 'ent in the vertical i'lircction will be greatet when the connections at 28') and 30 are horizontally aligned with the shafts l .d 1-2 for the gears 27 and 28 and smallest when the points of conneetion 29 and 30 are vertically aligned therewith, the vertical components gradually diminishing from the horizontally to the vertically aligned position thereof, the plate will move toward the plate 2 1 a smaller distance for each rotation of the member 3 1 when said plates are close together than when they are a greater distance apart, as when the connecting points 29 and 30 are horizontally aligned with the shafts for the gears.

It is, of course, evident that when the gears are turned to such a position that the connections 29 and 30 are vertically aligned with the shafts 4G1 and 42 and above the same, tne rate of adjustment will also be small, but this part of the adjustment is notused, as the plates will then be so far apart that in practical use they would never assume such a position. Instead of usine' the construction shown in Figs. 1 to 3 inclusive, the construction shown in Figs. 1 to 6 may be used, in which the base 43 has the supportin member 14 mounted thereon, said supporting member being supported with a terminal 45 having a thumb nut as thereon for securing the conductor 17 thereto.

Mounted on the member 44'. are the disks 48 and 19 which are provided with suitable teeth on the outer edge thereof so as to provide gears that are intermeshing. The gear 50 mounted on the shaft 51 meshes with the teeth provided on the disk 19 so that said disk-like members 48 and i9 are driven by the shaft 51 through the gear 50. The shaft 51 is provided with a knurled thumb nut or thumb piece 52 for turning the same. {he members &8 and as are provided with downwardly extending circular bosses 53 which are adapted to rotate in similar rccesses in the block 4a. A collar or sleeve 54; is provided in each of the members 18 and 19, the collars being mounted on the rods 55 and 56 which are secured to the collars 5 1 in any suitable manner as by means of the enlarged screwthreaded portions 57 of the members 55 and 56. A headed end portion 58 is provided on each of the members 55 and 56 which extend into the recesses 59 in the base 13. The rods 55 and 56 are thus clamped to the base or block ed by means of the screwthreaded portions 57 so that the same will be fixed thereto, but the members 43 and 19 are free to rotate on the collars 5a. Secured in any suitable manner, as by means of soldering, to the disks 43 and 19 are the cylinders or drums 60 and 61, said drums 60 and 61 being provided with screw threads 62 and 63 thereon, which as will be seen, are of gradually increasing pitch from the bottom toward the top of the drums and are oppositely directed.

Mounted on the rods 55 and 56 is a cross piece 64: secured to the tubular members 5 and 66 which are slidable on the rods 55 and 56. Secured to the cross member 64 in fixed relationship thereto, is the stem 67 which is provided with a head 68 thereon having the grooves 69 and 70 therein which are adapted to receive the threads 62 and 63 therein. It will be seen that as the members 418 and 19 are rotated by means of the member 52 that the cross piece 6%, due to the engagement of the men ber 68 with the screw threads, will be moved lengthwise on the rods 55 and 56, and that the amount of movement toward and away from the base for each rotation of the member 412 will be greater the greater distance the head 63 is from the bottom of the drums (i0 and {51. The member is provided with a horizontally extending arm 71 and with a down wardly extending portion T2 having the head 73 thereon which is made in the form a disk to serve as one plate of a condem the other plate 7 1 of which is mounted on the insulating base 13 and is provided with a laterally extending portion '(5 having the terminal 7 6 thereon provided with a thumb nut 77 for securing a conductor thereto. Thus it will be seen that a line adjustment of the condenser is provided when the plates are closely adjacent each other and a rough adjustment when they are more widely spaced, which is the form of adjustment that is the most desirable for accurate and quick adjustment of a condenser.

Having thus described my invention, what I desire to claim and secure by U. S. Letters Patent is:

1. In a condenser, a movable plate, sta tionary plate, means comprising a reduction gearing connection for moving said movable plate toward and away from said stationary plate and a member for actuating said means, said means providing a positive drive between said movable plate and actuating means providing for a slower move ment of said plate relative to the movement of sa-id'member when said plates close together than when said plates are apart.

2. In a condenser, a movable plate, a tionary plate, means comprising rotatable circular members and a connecting rod for moving said movable plate toward and away from said stationary plate, a member for actuating said means and a reduction gearing between said last member and said rotatable members, said means providing for a slower movement of said plate relative to the movement of said member when said plates are close together than when said plates are far apart.

In witness whereof, I hereunto subscribe my name this 19th day of June A. D., 1922.

WILLIAM G. BR-UMDER. 

